Explore our 10 inch frosted crystal singing bowls. 10 inches is an optimal size for singing bowls, as it is large enough to start getting a louder voice, they are generally easy to play, vibrant, and are still lightweight and very portable. You can find every crystal bowl note in a 10 inch size. Sometimes a B will be a 3rd octave in the 10 inch size, but usually will be a 4th octave. The main notes purchased in a 10 inch size are a C, D, E, F and G.